What Causes the Impact Noise When Shifting into Reverse Gear in a 7-Speed DSG Dry Clutch Transmission?
3 Answers
Here are the specific reasons for the impact noise when shifting into reverse gear in a 7-speed DSG dry clutch transmission: 1. Cold Start: During a cold start, the transmission fluid has poor flowability, and the internal gears are not sufficiently lubricated, resulting in abnormal noises during gear shifts. 2. Aged Transmission Fluid: Transmission fluid, like engine oil, requires regular replacement. When the fluid ages, its lubrication capability decreases, leading to noticeable impact sensations and abnormal noises during gear shifts. 3. Worn Transmission Gears: Improper vehicle usage by some owners can cause wear on the transmission gears. When the gears are worn, metallic noises may occur during gear shifts.
I often drive Volkswagen cars, and the impact sound in reverse gear with this 7-speed dry DSG might be related to clutch issues. When reversing, if the dry clutch plates in the transmission are worn or misaligned, they can produce an impact sound during gear shifting. Sometimes, improper software-controlled shift timing can also cause this noise. Additionally, prolonged neglect of transmission fluid changes can lead to poor lubrication and increased friction. It's recommended to regularly inspect the clutch plates. If you hear noticeable noises, it's best to visit a 4S shop or professional repair shop for diagnosis without delay to avoid damaging the entire transmission system. Although reverse gear operates at low speeds while driving, impact sounds may indicate potential safety hazards. Always pay attention to the coolant temperature gauge and dashboard warning lights during driving, and avoid using reverse gear when parking on slopes.
Last time I just repaired my Golf, the impact sound in the 7-speed DSG reverse gear is mostly due to clutch synchronization issues. The dry design lacks lubrication, making it prone to vibration noise during reverse gear engagement. It could be mechanical wear, such as gear wear, or an electronic control unit failure causing misaligned shifting. It's recommended to first scan for error codes with a diagnostic tool and check if the clutch plates and plug connections are loose. Regular maintenance is crucial, especially in city traffic where frequent gear changes accelerate wear. For safety, operate the reverse gear slowly when hearing the noise, avoid sudden acceleration, and seek immediate repair if the problem is severe to prevent affecting driving safety.
